裂谷热简介     

王占江蔺长明  陈建国 《中国动物检疫》2001,18(8):46-46

裂谷热（Ｒｉｆｔ Ｖａｌｌｅｙ　Ｆｅｖｅｒ），又名绵羊和牛传染性地方流行性肝炎，是非洲流行的一种致命的传染病，通过蚊子叮咬传染人类和牲畜，主要症状是急性腹泻和发高烧，进而严重损害人和牲畜的肝和肾，部分病人来会因血管破裂而死亡。这是一种重要的人畜共患病，国际兽疫局（ＯＩＥ）将其列为Ａ类疫病。１流行病学 裂谷热的第一次报导是１９３１年在肯尼亚的拿伐逊湖边农场。１９５１年南非联邦爆发本病，有２００００多人被感染，１０多万只绵羊死亡。１９７７年传入埃及造成人间大流行，数万人患病，其中数千人失明和死亡。２０…  相似文献   

不同欧李品种(系)光合与水分利用特性比较   总被引：1，自引：0，他引：1  

哈小丽  韩占江  梁继业 《北方园艺》2017,(2)

以9种不同欧李品种(系)为试材,使用GFS3000光合测定系统测定了自然条件下叶片的光合和水分利用特性。结果表明:9种欧李品种(系)的净光合速率(Pn)、叶片气孔导度(Gs)、胞间CO2浓度(Ci)、蒸腾速率(Tr)、蒸腾比率(TR)、水分利用效率(WUE)均存在差异;在新疆生产建设兵团第十四师二二四团的生长环境下,Pn与Gs、Tr、WUE呈极显著正相关关系,而与Ci、TR呈极显著负相关关系;Ci与TR呈极显著正相关相关关系,与WUE呈极显著负相关关系;Gs与Tr呈极显著正相关关系,与TR呈显著负相关关系;Pn最高的"宏宇Ⅵ号"其WUE较高,但不是最高;WUE最高的"宏宇Ⅰ号"其Pn较高,但不是最高;"01-01号"的Pn和WUE均最低,其它品种(系)的Pn和WUE均处于中等水平,不同的欧李品种(系)通过不同方式协调自身的光合和水分利用来适应生长的环境。  相似文献   

用冠接法建立橡胶优良有性系种子园研究初报     

叶应福  窦美安  张健珍 《热带农业科技》1999,(4)

用冠接法建成93-114×PR107,天任31-45×PR107组合种子园,可分别提早2～3年和1～2年开花结果,是建立优良有性系种子园快速、有效的方法。  相似文献   

Sex reversal and nursery growth of Nile tilapia, Oreochromis niloticus (L.), free-swimming in earthen ponds     

R P Phelps  G Conterras Salazar  V Abe  B J Argue 《Aquaculture Research》1995,26(4):293-295

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硬枝碱蓬HPLC指纹图谱建立及模式识别研究     

马涛  赵宇  韩占江 《塔里木大学学报》2014,(4):96-104

为了对硬枝碱蓬样品质量进行评价,采用高效液相色谱法对9个不同采集地的硬枝碱蓬样品进行测定,建立指纹图谱,并结合中药相似度软件和主成分分析法进行模式识别研究。结果表明,试验确定的最佳条件为:提取溶剂为100%甲醇,用量为15 m L,流速为1.0 m L/min,色谱进样时间为20 min,流动相为甲醇(A)-水(B),采用100%甲醇等度洗脱,检测波长为254 nm。精密度试验、重现性试验、稳定性试验测定结果的相似度均在0.9以上,本研究所建立的基于主成分分析的模式识别方法准确可靠;中药相似度软件能够对不同地点的硬枝碱蓬材料进行区分,不同产地硬枝碱蓬的差异可清晰地显示出来。  相似文献   

Studies on the Molecular Structure of Vessels in Secondary Xylem of Stem from Three Carambola Varieties     

CHEN Yan  YUAN Chang-chun  CHEN Xiao-ting School of Life Science  Technology  Zhanjiang Normal University  Zhanjiang 《（《农业科学与技术》）编辑部》2008,(4)

[Objective] The aim of this study was to provide the theoretical basis for variety identification of carambola and pomiculture.[Method] The molecular structure of vessels in stem secondary xylem from three carambola varieties of Malaysia 8,Misi and Malaysia B17 were studied by cell image analysis system and microphotography.[Result] The molecular structure of vessels in stem secondary xylem from carambola was as follows:the first type had tails in two ends,the second type had tail in one end,and the third type had no tails in two ends.The average length of vessel elements was from 328.88 to 366.09 μm,while its average width was from 44.61 to 52.43 μm.Most of the end wall was simple perforation plates,while the alternate-opposite pitting was the major forms of pitting.[Conclusion] Most characteristics of vessel elements from carambola were evolutionary characters of vessel elements in the process of phylogeny,but there were more primitive characters,for example,both two ends of vessel had tails or just one end had tail,and end wall was inclined.The molecular structure of vessel from carambola was in accordance with its ecological adaptability,and the growth characteristics of different varieties were also in accordance with the difference of molecular structure of vessel.  相似文献   

Presence of Ureaplasma diversum in the Australian cattle population     

B Argue  KK Chousalkar  PJ Chenoweth 《Australian veterinary journal》2013,91(3):99-101

In cattle, Ureaplasma diversum has been associated with decreased fertility, granular vulvovaginitis, endometritis, salpingitis and spontaneous abortion in cows and seminal vesiculitis, balanoposthitis and changes in bull sperm. The presence of U. diversum within the Australian cattle population has not been established. One of the aims of this study was to determine if U. diversum was present in Australian cattle, using culture and polymerase chain reaction (PCR), both of which are considered to be gold standards for bacterial identification. Of 100 samples collected from 66 male and 34 female cattle, 15 were positive for U. diversum. Therefore, Australia can no longer be considered free of U. diversum. Further studies should be conducted to ascertain the effects of U. diversum within Australian cattle herds and, if warranted, to investigate prevention, treatment and eradication protocols.  相似文献   

6FX-1000型核桃风选机设计与试验     

买合木江·巴吐尔  李忠新  杨莉玲  刘佳  朱占江  闫圣坤  刘奎  祝赵帅  毛吾兰 《农业工程》2016,6(4):69-70

利用丰满核桃和空瘪核桃空气动力特性方面的显著差异,设计了6FX-1000型核桃风选机,采用比重式风选方法对核桃进行分选。介绍了核桃风选机的结构、基本参数和工作原理,试验证明,该机生产率是人工作业的50倍以上,而成本不足人工成本的2.5%,分选率≥90%,大大降低了劳动强度和生产成本,对核桃深加工产业的发展具有重要的意义。   相似文献   

农杆菌介导法将热激转录因子8基因转入大豆   总被引：4，自引：0，他引：4  

尹青女  吕慧颖  朱保葛  张敬 《分子植物育种》2004,2(6):783-787

植物转化是开展基因工程育种和鉴定基因功能的重要途径。本研究的目的在于向大豆受体导入热激转录因子8（heat shock factor 8,hsf8)基因,以加强目的基因hsp70的表达和增加转基因大豆的抗逆性,同时探索提高大豆转化率的途径。本文以大豆子叶节为外植体,通过农杆菌介导法将hsf8基因转入栽培大豆品种科新3号中,获得了13株抗卡那霉素的转化植株。PCR检测表明,其中的9株呈阳性反应,证明hsf8基因已整合到大豆基因组中。本实验获得的实际转化率为2．39％。文中讨论了选择适宜的种子灭菌方法和大豆受体品种对提高转化率的有效作用。  相似文献   

Case-control study investigating an anthrax outbreak in Saskatchewan, Canada--Summer 2006     

Epp T  Waldner C  Argue CK 《The Canadian veterinary journal. La revue veterinaire canadienne》2010,51(9):973-978

In 2006, an outbreak of anthrax in Saskatchewan affected several species but most of the losses occurred in cattle. Potential risk factors contributing to this outbreak were investigated through questionnaires involving 117 case farms and 259 control farms geographically representative of the Saskatchewan beef herd. The occurrence of flooding [odds ratio (OR) = 3.4; 95% confidence interval (CI): 1.8 to 6.4], wetter pastures (Good: OR = 3.5; 95% CI: 1.4 to 8.5; Wet: OR = 7.2; 95% CI: 2.9 to 18.1), shorter pasture grass length (OR = 3.0; 95% CI: 1.4 to 6.4), and higher density of the animals on pasture (OR = 3.0; 95% CI: 1.6 to 5.7) were more likely to have been reported for case herds than for control herds. Case farms were more likely than control farms to have vaccinated more than 1 week after the first reported case in the rural municipality (OR = 6.3; 95% CI: 2.6 to 15.3). Timing of vaccination in case herds was also significantly associated with the occurrence of subsequent deaths on these farms (P = 0.001).  相似文献